WAAS卫星播发电文一致性分析

星基增强系统(SBAS)是在传统GNSS的基础上为了进一步满足民航用户对卫星导航系统越来越高的精度、完好性、连续性和可用性需求而应运而生.目前全球已建立起了多个SBAS系统,其中提供服务时间最长的是美国的WAAS系统.WAAS系统包括38个参考站、3个主控站、6个上注站和3颗GEO卫星,每个参考站配备3套独立的监测接收...

Consistency analysis of WAAS satellites broadcast messages

Satellite based augmentation system (SBAS) is built on the basis of traditional GNSS in order to further improve accuracy, integrity, continuity and availability. At present, many SBASs have been established around the world. Among them, the system which provides the longest service is the WAAS of the United States. WAAS has 38 reference stations, 3 master stations, 6 ground uplink stations and 3 GEO satellites. In order to guarantee system redundancy, each WRS has three independent receivers. The system structure of WAAS was introduced, and the similarities and differences of different types of message data transmitted by different GEO satellites in WAAS were compared. The consistency of message broadcasting and the impact on users due to different GEO broadcast messages were analysed. Also, the specifications and constraints of WAAS on user selection of SBAS signals in minimum operational performance standards were analysed. The essential difference between SBAS and traditional wide area difference system was revealed from the perspective of applying requirements, and it was pointed out that integrity real time monitoring is based on establishing a sufficiently reliable ground monitoring network and satellite communication link.